Here are a couple gameplay videos
http://ps3.ign.com/dor/objects/755358/dc-comics-mmo/videos/DC_ONline_offscreen_ccSD08_pickupcar.html
http://ps3.ign.com/dor/objects/755358/dc-comics-mmo/videos/DC_ONline_offscreen_ccSD08_running.html
that actually looks pretty fun. Obviously the fluidity of the gameplay could use some work. But I'm sure that will be improved as the game gets closer to release.
The combat looks a lot more fun and action oriented then compared to City of Heroes. It also appears like there is a lot more depth to the fighting.